Transmission medium  

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Loisirs Littéraires au XXe siècle (English: "Literary leasures in the 20th century") from the story "The End of Books" by French writer Octave Uzanne and illustrated Albert Robida. The illustration depicts a female reader of the 20th century, imagined by Robida, who is listening to  "12 poètes assortis" (twelve assorted poets) on a balcony overlooking a future city.
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Loisirs Littéraires au XXe siècle (English: "Literary leasures in the 20th century") from the story "The End of Books" by French writer Octave Uzanne and illustrated Albert Robida. The illustration depicts a female reader of the 20th century, imagined by Robida, who is listening to "12 poètes assortis" (twelve assorted poets) on a balcony overlooking a future city.

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A transmission medium is a system or substance that can mediate the propagation of signals for the purposes of telecommunication. Signals are typically imposed on a wave of some kind suitable for the chosen medium. For example, data can modulate sound, and a transmission medium for sounds may be air, but solids and liquids may also act as the transmission medium. Vacuum or air constitutes a good transmission medium for electromagnetic waves such as light and radio waves. While a material substance is not required for electromagnetic waves to propagate, such waves are usually affected by the transmission media they pass through, for instance, by absorption or reflection or refraction at the interfaces between media. Technical devices can therefore be employed to transmit or guide waves. Thus, an optical fiber or a copper cable is used as transmission media.

Electromagnetic radiation can be transmitted through an optical medium, such as optical fiber, or through twisted pair wires, coaxial cable, or dielectric-slab waveguides. It may also pass through any physical material that is transparent to the specific wavelength, such as water, air, glass, or concrete. Sound is, by definition, the vibration of matter, so it requires a physical medium for transmission, as do other kinds of mechanical waves and heat energy. Historically, science incorporated various aether theories to explain the transmission medium. However, it is now known that electromagnetic waves do not require a physical transmission medium, and so can travel through the vacuum of free space. Regions of the insulative vacuum can become conductive for electrical conduction through the presence of free electrons, holes, or ions.

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Transmission medium" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic. See Art and Popular Culture's copyright notice.

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